Cutting-nippers for removing insulation from cables.



No. 893,132. PATENTED JULY 14, 1908.

v H. S. BORK. GETTING NIPPERS FORREMOVING INSULATION PROM CABLES.-

APLIOATION FILED MAY 28. 1907.

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HANS SORENSEN BORK, OF RANDERS, DENMARK.

CUTTING- NIPPERS FOR REMOVING INSULATION FROM CABLES.

Specification of Letters Patent.

Patented July 14, 1908.

Application filed. May 28, 1907. Serial No. 376,201.

T 0 all whom it may concern:

Be it known that 1, firms SORENSEN Bonn, electrician, a subject of the King of Denmark, residing at Randers, Denmark, have invented new and useful Improvements in Cutting-Nippers for Removing Insulation from Cables, of which the following is a specification.

This invention consists in a pair of nippers adapted to remove the insulation from the ends ofelectrical conductors when the latter are to be connected to cable shoes, binding posts or the like.

On the accompanying drawings Figure 1 is an elevation, partly in section, of a pair of nippers serving to remove the insulation from ordinary electric wires, Fig. 2 a top view of the same ni pers, Fig. 3 an elevation,

partly in section, 0 a pair of nippers adapted to remove the insulation from lead cables, Fig. 4 a side view of the same nippers, and Fig. 5 a horizontal section of Fig. 4.

Referring to the drawings, 1, 1 are the jaws of the nippers represented in Figs. 1 and 2, said jaws eing shaped, at the one side, like the jaws of ordinary cutting nippers, while they are, at the other side, shaped as gripping faces 2, which are adapted to engage the outer surface of the insulated wire when the latter is inserted between them. In the gri ping faces 2 is a cavity wherein is seated a knife 3 whose edge is preferably concave and projects'somewhat beyond the gripping faces of the jaws. The knives may be adjusted, by means of an adjusting screw 4, so as to project sufficiently, when the nipers are closed, to penetrate the insulating ayer, but not the metallic core.

The nippers are manipulated in the following manner. The wire to be stripped is inserted between the 'aws, then the nippers are closed and turned ack and forth around the wire a few times. Thereby the insulating layer is cut through, all the way round, without the metallic core being damaged bythe knives, since the gripping faces bearing against the insulation prevent the knives from cutting into the wire. If it is desired to strip the wire-the nippers aredrawn toward the end of the wire, removing the insulation. Preferably the grip ing faces 2 are semi-circular in form so that they will fit tightly around the wire and prevent the latter from moving sidewise toward the edges of the knives and thus be injured.

The invention may be carried into efiect either as special nippers adapted only to wire stripping, or it may be used in connection with other tools, such as cutting nippers,

universal pliers, ordinary pliers, etc.

The screw 5 shown on the under side of the gripping face serves to secure the knife. in place, after it has been adjusted. After being loosened this screw'may slide, with the knife, in an oblong hole 6 in the lower face of the jaw.

If one single pair of nippers is to be used for stripping wires of various diameters, this may be attained either by providing several different gripping faces with common or separate knives, corresponding to the different diameters of wire, or the jaws 1 may be adapted for the substitution of other gripping pieces fitting to wires of other diameters, and finally the adjustment of a screw 7 may determine how near the jaws will go together, when the nippers are closed.

In the pliers shown in Figs. 35 and intended for use in stripping lead cables, sev- "eral independently adjustable knives 3 are provided in the exchangeable gripping pieces 2. The distance between the knives corresponds to the distance between the points where the various layers of the cable insulation are to be cut through, and the knives are adjusted so that the first one cuts only through the outer layer, while the next one cuts throughthe first and second layer, etc., the last knife cutting through all the layers, and down to the metallic core.

What I claim as my invention, and desire to secure by Letters Patent, is

1. Nippers for cutting the insulation of electric wires having on the jaws concave, semi-cylindrical gripping faces adapted to fit all around the outer surface of the insulated wire, and knives arranged transversely of the direction which the wire assumes when located in said gripping faces, said knives projecting somewhat into the grooves of the latter.

2. Nippers for cutting the insulation of electric wires having on the jaws extensive, concave, semi cylindrical gripping faces adapted to fit along a large surface all around the outer surface of the insulated wire, and knives arranged transversely of the direction which the wire assumes when located in said gripping faces, and projecting somewhat into the grooves of the latter.

3. Nippers for cutting the insulation of electric wires having a pair of jaws, and a plurality of pairs of knives successively arj ranged, each pair being differently spaced apart and all of said knives being adapted to act simultaneously upon the wire.

4. Nippers for cutting the insulation of electric wires having a pair of jaws, a plurality of knives successively arranged and adapted to act upon the wire simultaneously, and means for adjusting said knives.

5. Nippers for cutting the insulation of an electric wire having a plurality of layers of insulation, such nippers having separate means for cutting each of said layers.

6. Nippers for cutting the insulation of j electric wires having a pair of jaws, and a plu- 15 rality of knives arranged side by side on each jaw, and means for independently adjusting such knives in edgewise directions, whereby each pair thereof may be arranged with their edges at different distances apart. 20

In witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

HANS SORENSEN BORK.

Witnesses:

ALFRED RAVSING OLSEN, JULIUs LEHMANN. 

